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Tell me the differences between enumeration and iteration?Which can use where in realtime?
javabuddy
- Jan 10th, 2011
Between two Enumeration is older and its there from jdk 1.0 while iterator was introduced later. The functionality of Enumeration interface is duplicated by the Iterator interface. Iterator has a rem...
chandaka
- Sep 22nd, 2009
The functionality of this interface is duplicated by the Iterator interface. In addition, Iterator adds an optional remove operation, and has shorter method names. New implementations should consider using Iterator in preference to Enumeration.
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What is the purpose of singleton design pattern?
mani.sivapuram
- Feb 10th, 2011
Singleton design pattern is used to create only one instance.I want to a an example when we are using this singleton design pattern in real life.generally the dao classes like insertDao,updateDao,dele...
shreesha.s
- Sep 5th, 2010
Singleton Design Pattern is used when we would like to have a single instance. A class distributes the only instance of itself. It will be used with Connection Pool usually.
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Platform and Machine Dependency
What is the difference between platform dependency and machine dependency?
tamil_try
- Feb 19th, 2011
Platform Dependency: If a compiled program requires any additional library(s) to make the original program run on any particular OS, is platform dependency. Example, to run an executable C or C++ prog...
Erumesh kumar
- Jan 15th, 2011
A program that run at any OS means, that is called platform independent and those programs run at any architecture of computer (hardware) are called machine independent and the phenomenon is platform and machine independency.
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What is the difference between StringBuffer and StringBuilder class?
santhakumarchimata
- Mar 15th, 2011
StringBuilder is a feature of Java 5Methods in StringBuffer are Synchronized & thread safe.Methods in StringBuilder are not Synchronized & not thread safe.If you want faster access use StringBulder. If you want your string to be thread safe, use StringBuffer.
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What is the difference between Inheritance and Aggrigation?
vinaymudgil007
- Mar 21st, 2011
Inheritence means --> "is-a" relationshipe.g. HONDA CITY is-a CARAggregation means --> "has-a" relationshipHONDA CITY has-a engineHope this makes it clear !!!
navneetgoyal2000
- Jan 5th, 2011
If we have to explain it with example, then Inheritance (IS A or TYPE OF) & Aggregation (HAS A) can be understood as:a CAR IS A (an) Automobile. (Inheritance: Car inherits its properties from Automobile)Whilea CAR HAS A (an) engine. (Aggregation: Car Class has an Object of engine class)
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What will be the result and why
int i=10;i=i++;System.out.println(i);
jawaharl0207
- Nov 30th, 2009
11, because even it is post increment, it will increment by 1 when it is going to reach println() statment, for the first statement(i++;) it wont increment, after completing the execution of this method i incremented by 1 and prints the result.
sujithkthomas
- Nov 12th, 2009
Yes this is similar totemp = i;i = i+1;i = temp;It will restore the value 10 since post increment. If its pre-increment last assignment will be i = temp+1
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What is the difference between String and StringBuffer? Which is better to use in project?
mani.sivapuram
- Apr 14th, 2011
String is a immutable.What is immutable the state of an object is not changed if we initilize once.i.e for example String s1="Geek" ...
sankarsansinha
- Feb 5th, 2009
String objects are constants and immutable where as StringBuffer objects are not.StringBuffer Class supports growable and modifiable string where as String class supports constant strings. Strings onc...
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How would you declare a SingleThreaded servlet
mayur
- Aug 15th, 2007
We can put the code in the servlet in a synchronized block with a static member as a monitor.
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How does serialization work
Sarje
- Aug 28th, 2009
In serialization process first state of the object is written to the java.io.ObjectOutputStream using its writeObject() method.Then this ObjectOutputStream writes the state of the object to the java.i...
sampra
- Feb 14th, 2008
It convert data object into flat format and transfer it any other remote mechine by any medum and thn there reconstruction of object will be done
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How would you keep track of a session
Rushi
- Apr 21st, 2009
HTTP is a stateless protocol so, for maitaining the session there are three session tracking technices1. Cookies 2. URL rewriting3. Hidden Form fields
vijaysdange
- Mar 25th, 2006
use session varaible accross application String vijay=request.getParameter("vijay"); &n...
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How does JVM help to achieve platform independence
Ashwinshenoy7
- May 9th, 2011
JVM means Java Virtual Machine. Java has been designed in such a way that makes it platform independent and can work on any type of operating system and platform provided JVM is installed in it.So, co...
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Explain the keywords - native, transient, volatile, finally
vinaymudgil007
- Jun 2nd, 2008
Native :- Specifies that the code that should be implemented is writtern in a language other than JAVATransient :- Specifies that the associated variable should NOT be serializedVolatile :- directs th...
Siva Prasad Ashwini
- Oct 17th, 2005
native:when you want to get functionality from particular language like c/c++ native is usedTransient : it is state of which value doesnt persist volatile : is an indication to the compiler that ...
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What is difference between & and && in java
nehagarg2822
- Jun 1st, 2011
It depends on the type of the arguments:- For integer arguments, the single ampersand ("&")is the "bit-wise AND" operator. The double ampersand ("&&") does not mean anything as it is not defined f...
raju g
- Mar 24th, 2011
The Boolean && operator is used for determining two relational expressions and returns true if only if both returns true, otherwise returns falseThe Boolean & operator is used to perform B...
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What are the differences between EJB and Java beans
naresh17201
- Jul 14th, 2010
1. Java beans live in a single local JVM (address spaces) and can be either visual or non-visualEJB are non-visual distributable components, which can live across multiple JVMs2. Java beans designed t...
aleemkh
- Jul 30th, 2008
JavaBeans are just regular class files. They have get and set methods only. They are not controlled by separate EJB server like JBOSS etc, They can easily work on JVM itself and they dont require any ...
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String s1=s+"World";
S.O.P(s1); means printing "HelloWorld".How ?">Strings are immutable.But String s="Hello"; String s1=s+"World"; S.O.P(s1); means printing "HelloWorld".How ?
Amit Khaware
- Jun 17th, 2011
String s = "Hello"; means one object with value "Hello" will be created in the heap and reference variable s will refer to the object.but whenString s1 = s+"World";w...
talktoatish
- Aug 15th, 2009
Very tricky question.Asked me in Oracle interview for 4 years level of expHere is the answer: When JVM see the code where two three string objects has been added with + operator then it is using the S...
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What will this printint i=10000System.out.println(i*i);and explain why ?
I do't know
vasu.funky
- Oct 7th, 2007
It will give you the multiplied value..does not throw an error..we are no way storing this result (i mean you are not storing thisvalue in any interger or so...) it is just displayed in the sop which expects a string value
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What would happen if you say this = null
ajkush
- May 6th, 2009
If the value is null or zero, the difference is simple as difference between I know and I dont know.Null means I dont know the value and zero means I know the value.
ashokkumar
- Jan 25th, 2007
[root@tm1 classes]# javac -d . ../../../src/com/tm/slynx/util/AuditLogBean.java../../../src/com/tm/slynx/util/AuditLogBean.java:47: cannot assign a value to final variable thisthis = null;^1 error
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Path and classpath
What is the main difference between path and classpath in java language?
gadhiaharsh
- Jul 23rd, 2011
Hi friends, here's an answer for the question PATH defines where exactly the complier should find the tools to compile and run the java programs. CLASSPATH defines where exactly the classes required...
Core Java Interview Questions
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